Draw the iron carbon phase diagramand labeling all lines and areas.Then:-1- find the melting point of cast ironwith 2.2%C.2- explain in detail the steps ofsolidification and transformation ofcast iron with 3%C.3- draw the expected microstructureof iron with 0.1%C ; 0.4%C; 0.83%C;2%C; 4.3%C.4-draw the cooling curve for hypersteel with 1.8%C.5- find the percentage of liquid andsolid for cast iron with 3.8%C at 1160degree Celsius with the compositionfor each of them.

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Draw the iron carbon phase diagram and labeling all lines and areas. Then:- 1- find the melting point of cast iron with 2.2%C. 2- explain in detail the steps of

Welding: Principles and Applications (MindTap Course List)

8th Edition

ISBN:9781305494695

Author:Larry Jeffus

Publisher:Larry Jeffus

Chapter26: Welding Metallurgy

Section: Chapter Questions

Problem 27R: What are the three steps in precipitation hardening?

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1. Why does the tensile strength of steel, which contains only austenite at room temperature, differ fromsteel that shows only pearlite in its microstructure? Give two important reasons for the difference. 2. What general prerequ_isites exist for the formation of martensite in steel? 3. What is an isothermal transformation of a material in the solid state condition? 4. Draw a typical isothermal transformation diagram for plain .carbon eutectoid steel and indicate thevarious decomposition products expected by simple diagrammatic drawing.
Draw Iron - Iron Carbide Phase diagram and show the following: 1- Temperature, phases and carbon weight for Eutectic. 2- Temperature, phases and carbon weight for Eutectoid Thecementite, 3- austenite, ferrite, delta phases with their 4- Types of ferrous alloys on different carbon rates. 5- Draw the phase at T= 700 CD and 0.7 wt% C what is its name ? temperatures and carbon weight.
Q3 (a) Three plain-carbon steel types are: eutectoid, hypoeutectoid, and hypereutectoid can be seen in the Iron-Carbon phase diagram as shown in Figure Q3(a). Explain the effect of heating to 780 °C and slow cooling to 650 °C on these material types for the carbon weight percentages of 0.4%, 0.8% and 1.2%.. (i) (ii) Draw the effect of temperature on the microstructure of one plain carbon steel tvpe. (1539* C) 2902 F 2554 F Liquid L+ Austenite L+Cementite Austenite 2065 "F (1130 C) Eutectic (Ledeburite) Aus, + Ferrite Austenite + Cementite (908* C) 1666* F 1333 F (723 C) K. Eutectoid (pearlite) Ferrite Ferrite + Cementite 0.8 2.0 4.3 6.67 Fe,C Percent carbon by weight Hypo- eutectoid Hyper- eutectoid Hypoeutectio - Hypereutectic Steels Castirons Figure Q3(a) Temperature, F
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Below is a continuous cooling transformation curve for steel (upper) and for a silicate melt (lower). Describe the similarities and differences as follows. a. What is the critical cooling rate in each case? b. What phase(s) form in each case when the critical cooling rate is exceeded? c. What phase(s) form in each case if the cooling rate is very slow? 800 1400 Ae lemperature Austenite *peorlite begins 10FI 700 1200 Austenitepearlite complete 1600 1000 5009 800 Tronsformation stops 400 600 300 400 Austenite -mortenstic structure 200 -Isathermal dogram Continuous transformaton diogrom Constant rate coding curves - 100 200 Findl structure Mortensite Morlensite i peorlile Peorite (softer, coorser- 0.1 10? 10 Tronsformation time, seconds Continuous Cooling-Transformation (C-T)Diagram (Derived from the isothermal-transformation diagram for a plain-carbon eutectoid steel) 1200 Glass Crystallization begins 1100 1000 Critical cooling rate Glass-ceramic 900 Crystallization ends 800 700 102 10…
Using the TTT diagram for eutectoid steel, draw the specified cooling path on the diagram. Indicate what phases you expect in the final product with percentage of each phase. Assume the material has been fully austenitized before cooling. a. Water cool to room temperature b. Hot quench in molten salt to 690°C and then cooled isothermally for 2 hours: c. Hot quench to 610°C hold 3 minutes and water quench
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3- The limited solid solubility Binary phase diagram has many types of reactions like and....... 4- the Crystal Structure of y (Austenite) is J. (12-1394) at 2.44 wt% has fec. 5- The maximum solubility of carbon in austenite, 2 occurs at 1147° C while the maximum solubility "wt% 0.022 W+% of BCC is At 727 oC ******* 6-steel alloys classified according to carbon conctration into.....n) and (hough). which are 7- in polymer structure the long molecules are composed of structural entities called repeat & Cham the along successively repeated and 8-polymer classified according to their molecular structure into hul (30Mark)
1) Name the mean reactions in Iron-carbon phase diagram with a general equation for each one. 2) What are the main quenching variables that govern cooling behavior and heat transfer (list only)? 3) Give the disadvantages of retained austenite.
For the isothermal time-temperature-transformation diagram provided (next page) for an Fe-C steel, answer the following (show any work on the diagram):a. based on the phases depicted, what is the average composition for the Fe-C alloy depicted (be specific). Explain your answer. (Note: you do have the Fe-C phase diagram in your notes and in the text for reference.)b. in an isothermal heat-treatment of a pure austenite structure at 300 C, how long will it take for austenite to be completely converted to bainite after bainite first begins to form?c. A standard size, automobile engine block and a 1 mm diameter rod of the same steel composition are taken from a heat-treatment furnace and immersed in a water bath at the same temperature. Do you expect that the microstructure of both pieces will be the same or different? Justify your answer.d. note that the time required to initiate the transformation of the austenite phase tends to decrease as the isothermal treatment temperature is reduced…
A hypo-eutectoid steel with composition of 0.5% carbon is heated to 1000°. Using the a iron-carbon phase diagram (also found in the course book, or here https://commons.wikimedia.org/wiki/File:Iron_carbon_phase_diagram.svg (Links to an external site.) (Links to an external site.)) answer the following questions. (a) What phase or phases will be present at 950°C? (b) If temperature is lowered from 950°C, at which temperature (estimate) α phase (Ferrite) will appear? (c) Use the lever rule to estimate how much (wt%) ferrite and how much austenite will exist just above 727 °C? (d) What happens to the austenite if the temperature is lowered below 727 °C? (e) Schematically sketch and label the resulting microstructure.